This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / fs / fscache / fscache-int.h

diff --git a/fs/fscache/fscache-int.h b/fs/fscache/fscache-int.h
new file mode 100644 (file)
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--- /dev/null
+++ b/fs/fscache/fscache-int.h
@@ -0,0 +1,93 @@
+/* fscache-int.h: internal definitions
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _FSCACHE_INT_H
+#define _FSCACHE_INT_H
+
+#include <linux/fscache-cache.h>
+#include <linux/timer.h>
+#include <linux/bio.h>
+
+extern kmem_cache_t *fscache_cookie_jar;
+
+extern struct fscache_cookie fscache_fsdef_index;
+extern struct fscache_cookie_def fscache_fsdef_netfs_def;
+
+extern void fscache_cookie_init_once(void *_cookie, kmem_cache_t *cachep, unsigned long flags);
+
+/*
+ * prevent the cache from being withdrawn whilst an operation is in progress
+ * - returns false if the cache is being withdrawn already or if the cache is
+ *   waiting to withdraw itself
+ * - returns true if the cache was not being withdrawn
+ * - fscache_withdraw_cache() will wait using down_write() until all ops are
+ *   complete
+ */
+static inline int fscache_operation_lock(struct fscache_object *object)
+{
+       return down_read_trylock(&object->cache->withdrawal_sem);
+}
+
+/*
+ * release the operation lock
+ */
+static inline void fscache_operation_unlock(struct fscache_object *object)
+{
+       up_read(&object->cache->withdrawal_sem);
+}
+
+
+/*****************************************************************************/
+/*
+ * debug tracing
+ */
+#define dbgprintk(FMT,...) \
+       printk("[%-6.6s] "FMT"\n",current->comm ,##__VA_ARGS__)
+#define _dbprintk(FMT,...) do { } while(0)
+
+#define kenter(FMT,...)        dbgprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
+#define kleave(FMT,...)        dbgprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
+#define kdebug(FMT,...)        dbgprintk(FMT ,##__VA_ARGS__)
+
+#define kjournal(FMT,...) _dbprintk(FMT ,##__VA_ARGS__)
+
+#define dbgfree(ADDR)  _dbprintk("%p:%d: FREEING %p",__FILE__,__LINE__,ADDR)
+
+#define dbgpgalloc(PAGE)                                               \
+do {                                                                   \
+       _dbprintk("PGALLOC %s:%d: %p {%lx,%lu}\n",                      \
+                 __FILE__,__LINE__,                                    \
+                 (PAGE),(PAGE)->mapping->host->i_ino,(PAGE)->index     \
+                 );                                                    \
+} while(0)
+
+#define dbgpgfree(PAGE)                                                \
+do {                                                           \
+       if ((PAGE))                                             \
+               _dbprintk("PGFREE %s:%d: %p {%lx,%lu}\n",       \
+                         __FILE__,__LINE__,                    \
+                         (PAGE),                               \
+                         (PAGE)->mapping->host->i_ino,         \
+                         (PAGE)->index                         \
+                         );                                    \
+} while(0)
+
+#ifdef __KDEBUG
+#define _enter(FMT,...)        kenter(FMT,##__VA_ARGS__)
+#define _leave(FMT,...)        kleave(FMT,##__VA_ARGS__)
+#define _debug(FMT,...)        kdebug(FMT,##__VA_ARGS__)
+#else
+#define _enter(FMT,...)        do { } while(0)
+#define _leave(FMT,...)        do { } while(0)
+#define _debug(FMT,...)        do { } while(0)
+#endif
+
+#endif /* _FSCACHE_INT_H */